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If cos (α + β) = 0, then sin (α – β) can be reduced to [NCERT Exemplar Problems] (a) cos β (b) cos 2β (c) sin α (d) sin 2α

Harshit Singh , 4 Years ago
Grade 12th pass
anser 1 Answers
Pawan Prajapati
Answer: b Explaination: (b) cos (α + β) = 0 = cos 90° ⇒ α + β = 90° sin (α – β) = sin (α – β + β – β) = sin (α + β – 2β) = sin (90° – 2β) = cos 2β
Last Activity: 4 Years ago
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